A rare case of an asymptomatic ovarian cystadenoma in a Labrador retriever

In this report, a clinical case of asymptomatic ovarian cystadenoma in a six-year-old, female Labrador retriever is described. The owner reported that the dog had been presented for routine spaying two weeks earlier in another clinic. During the operation, the veterinarian discovered a unilateral mass at the tip of the left uterine horn, which he could not remove and ovariohysterectomy was not performed. The patient was then referred to the Hospital of the Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria. Transabdominal ultrasonography revealed the presence of a hypoechoic mass in the region of the left ovary (50.0 × 71.8 mm). Complete blood cell counts and biochemical laboratory analysis showed no abnormalities. Caudal midline celiotomy was performed and a substantially altered left ovary was observed. The right ovary and uterus had a normal size and structure. Macroscopic changes in the other abdominal organs were not found. The histopathological finding of the neoplastic formation was characteristic of an ovarian cystadenoma. At follow-up one month after surgery, the dog had fully recovered, and at re-examination six months after surgery, she appeared healthy and all clinical findings were normal.